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Tuesday, April 9, 2019

Valve Handbook (Free PDF)

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Water is the most common energy carrier for heating and cooling of buildings. Its energy is transferred via radiators, heating or cooling batteries, fan-coil units, etc.The heating and domestic hot water needs of a building are constantly changing throughout the day,while being affected by conditions in- and outside the building.In order to maintain good heating and tap water comfort, a control system is required that constantly detects current needs and which is capable of countering fluctuations. But even using the most sofisticated control system, valve performance and control characteristics are still of vital importance. Leaking valves with unstable control qualities mean large operational costs and poor quality of comfort.Content:-1. Control functions in water systems2. Types of valves3. Pressure balancing in valves4. Other types of valves5. The design and function of control valves6. Valve sizes DN7. Nominal pressure and pressure rating PN8. Connection methods9. Face-to-face dimensions for flanged valves10. Flow characteristics11. What is the practical use of flow characteristics?12. Pressure drop13. Valve sizing (kv- and kvs values)14. Pressure drop diagrams simplify calculations15. The Regin valve sizing calculator16. Control range and accuracy17. Stroke18. Over- and undersized valves19. Valve tightness20. Tight valves conserve energy21. Sizing of domestic hot water control valves22. 3-way valves23. Radiator systems and radiator valves24. Valve materials25. Damages26. Electromechanical actuators27. Thermal actuators28. Regin’s Valve Centre